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Related Concept Videos

Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
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Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...
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Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Basophil Activation Test for Allergy Diagnosis
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Published on: May 31, 2021

Hypersensitivity reactions to quinolones.

Natalia Blanca-López1, Inmaculada Andreu, Maria J Torres Jaén

  • 1Allergy Service, Infanta Leonor Hospital, Madrid, Spain.

Current Opinion in Allergy and Clinical Immunology
|June 11, 2011
PubMed
Summary
This summary is machine-generated.

Hypersensitivity reactions to quinolones are increasing, necessitating accurate diagnosis. Drug provocation testing remains the most reliable method, though new in-vitro tests show promise for diagnosing these quinolone hypersensitivity reactions.

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Area of Science:

  • Pharmacology
  • Immunology
  • Clinical Medicine

Background:

  • Quinolone consumption has risen, correlating with increased hypersensitivity reactions.
  • Hypersensitivity reactions to quinolones, particularly anaphylaxis, are a growing concern.
  • Understanding quinolone hypersensitivity is crucial due to potential severity.

Purpose of the Study:

  • To review advances in quinolone hypersensitivity pathomechanisms and diagnosis.
  • To analyze cross-reactivity patterns among different quinolone generations.
  • To update knowledge on diagnosing immediate and nonimmediate quinolone reactions.

Main Methods:

  • Review of recent literature on quinolone hypersensitivity.
  • Analysis of diagnostic methods including skin testing, drug provocation, and in-vitro assays.
  • Examination of T-cell mechanisms in nonimmediate reactions.

Main Results:

  • Immediate quinolone hypersensitivity diagnosis often relies on drug provocation tests.
  • In-vitro and basophil activation tests may complement in-vivo diagnostics.
  • Cross-reactivity varies by quinolone generation, requiring individualized assessment.
  • Nonimmediate reactions like maculopapular exanthema involve T-cell mechanisms.

Conclusions:

  • Quinolone hypersensitivity reactions have increased in the last decade.
  • Accurate diagnosis of severe quinolone hypersensitivity remains challenging.
  • Drug provocation testing is the current gold standard, with in-vitro tests offering future potential.